Type-writing machine.



, NI-TED ST ATENT union.

GEORGE H. TREADGOLD, OF PORT HURON, MICHIGAN, ASSIGNOR ,OF ONE- THIRD TO JUNIUS F. WHITE, OF SAME PLACE.

TYPE-WRITING MACHINE.

SPECIFICATION forming part of Letters Patent No. 635,947, dated October 31, 1 899.

' Application filed August 17, 1898. Serial No; 688,808. (No model.)

To all whom it may concern:

Be it known that I, GEORGE H. TREADGOLD,

a citizen of the United States, residing at Port Huron, in the county of St. Clair and State of Michigan, have invented certain new and useful Improvements in Type-Writing Machines, of which the following is a speci'- fication, reference being had therein to the accompanying drawings.

It is the object of my invention to reduce to the minimum the power required to operate the keys of the machine, and thereby to greatly diminish the fatigue occasioned by long-continued operation.

The invention consists in the peculiar construction of a typewriting machine in which a motor is employed for actuating the typearms, the keys of the machine serving only to control the actuation of their respective 2o type-arms, as more fully hereinafter described and claimed.

In the drawings, Figure 1 is a vertical longitudinal section through my type-writing machine. Fig. 2 is a perspective view of one of the type-arms, the actuating-motor, gearroll therefor, and the controlling-key. Fig. 3 is a central longitudinal section through one end of the motor-roll.

A are the type-arms,-pi votally secured at B 0 to the .frame of the machine and adapted when operated to strike against the papercarrying roll 0.

In the drawings I have shown a construction of machine in which pairs of type-arms 3 5 on opposite sides of the machine are connected by links D with evener-levers E, which form a common. actuating device for said arms,

the opposite arms being adapted to be alter-.

nately locked from movement by laterallyshifting universal bars F. This construction,

however, forms no part of my present invention, which relates to the construction of the actuating devices for the type-arms and which may be applied to any ordinary type of machine.

V G are a series of levers connected by links II to the evener-levers E and fulcrumed at one end on a bar I, extending across the machine. J are a series of key-levers corresponding to the levers G and preferably fulcrumed ad- .jacent thereto on the bar I. At the free end of each lever G is pivotally secured a rackbar K, which is connected by a rod L to an arm M on the corresponding key-lever J.

N is a gear-roll extending across the machime in proximity to the racks K and adapted to mesh therewith. This roll is connected with a train of gearing 0, adapted to be driven by a spring or other suitable motor device. (Not shown.) The racks K are normally held out of engagement with the gear-roll N by springs P, sleeved upon the rods L and bearing against the arm M and lugs Q on the levers G.

R is a beveled or wedge-shaped bar extending across the machine beneath the rack-bars K, the ends of the latter being given an opposite bevel.

In the operation of the machine the motor being set in motion it will rotate the gear-roll N in the direction indicated, by the arrow, Fig. 1. As the operator strikes a key of the machine itwillpush the rod L and throw the rack-bar K into mesh with the roll. This will draw down thelever G and through the medium of the link H and evener-lever E will actuate one or the other of the opposite type arms A, according to the position of the bars F, and swing said arm up against the roll 0. Just before this movement is completed the beveled end of the rack K will strike against the beveled bar R, which will disengage the rack from the roll. It will thus beseen that the power required to actuate the type-arms is furnished by the motor, and all that is nec essary for the operator to do in depressing the keys is to overcome the slight resistance of the springs P.

In order to stop the running of the motor when the machine is not in use or where the operator pauses or is very slow in operating the keys, I provide means for automatically stopping the roll N after it has performed its work. This preferably comprises the gear or notched wheel S, which is sleeved upon the shank T at one end of the roll N and is provided with a segmental slot U, with which a pin V in the end of the roll N engages.

W is a spring for holding the gear in a position where one end of the slot bears against the pin.

X is a detent adapted to engage with the wheel S and secured to a lever Y, connected to a universal bar Z, extending beneath all of the keys J.

In the normal position of parts the detent X engaging with the gear or toothed wheel S will hold the same from movement, while the roll N after first carrying the pin V to the end of the slot U against the tension of the spring V is also arrested from further movement. \Vhenever one of the keys J is depressed, it will release the detent X, allowing the spring IV to unwind and the motor and roll N to start to run. As soon, however, as the key is released, the detent will reengage with the notched Wheel S; but the roll will still be free to run until the pin V has again traveled to the end of the slot U, which is sufiicient movement to complete the operation of the rack.

Vhat I claim as my invention is 1. In a type-writingmachine the combination of a motor-driven gear-roll, an arm or lever for actuating a type-arm, a rack pivotally secured to the free end of said arm or lever, a key, a rod connecting said key to said rack adapted to throw the same into engagement with said roll upon the actuating of said key, and a spring for retracting said rod.

2. In a type-writing machine the combination of a motor-driven gear-roll an arm or lever for actuating a type-arm, a rack pivotally secured to the free end of said arm, a rod connected to said rack sliding] y passing through a bearing in said arm or lever, a bell-crank key-lever connected to said rod, and a spring for retracting said rod.

3. In a type-writing machine the combination of a motor-driven gear-roll, a series of arms or levers actuating corresponding typearms, a transverse bar upon which said arms are fulcrumed, a rack pivotally secured to the free end of each of said arms connected to said rack and extending back toward said fulcrumed bar, a series of bell-crank key-levers fulcrumed on said bar adjacent to said arms and connected respectively with said rods, springs for holding said racks normally out of engagement with said roll, and a cam for automatically disengaging each of said racks from said roll at the completion of its movement.

4. In a type-writing machine the'combination of a series of type-arms, a motor for actuating said arms, a series of keys for respectively coupling their corresponding arms to the motor, a stop for limiting the movement of said motor, and a universal bar for tripping said stop adapted to be actuated by the operation of each key and means for-permitting a limited movement of said motor after the reengagement of said stop.

In testimony whereof I aflix my signature in presence of two witnesses.

GEORGE II. TRE-ADGOLD.

Witnesses:

HENRY A. BABCOCK, PETER IIANES. 

